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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I have gotten over 3kw of input power going through the mosfets. I measured at one time that 90% of that was making it into the coupling transformer. I am working on improving the coupler.
Here is a video showing 3kw melting aluminum. Near the end you can see molten metal dripping onto the metal plate at the bottom.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
"Can any of you tell me where I can get a crucible that can withstand molten steel? I saw Kimlaha use some asbestos-looking container and cover in his video. If I can contain the radiating heat I should be able to make a molten bath of metal in a few minutes." [/quote1263167811] Nice work!! Try this place Pricing is very reasonable and there is a catalog you can download for free!
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Thanks. I actually bought one from them. I got that one and it couldn't stand the heat. I think the problem is my crucibles are too thin and the heat/cold shock is destroying them.
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
Bummer! My bet would be that you are 100% correct about the shock. These things are very fragile! Maybe they could suggest a different material? Call them and get some free info, they know more about the materials than i do. Just thought the low cost would be what you were looking for. I work 2 buildings away from Pillar induction, i will take a trip over there on my lunch break tomorrow and ask them what they use. We do quite a bit of business with them!
Registered Member #2390
Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381
Well,... Stopped by Pillar like i said i would! They told me that cracking crucibles is in fact a matter of temperature shock. They told me that ,, "Induction heaters are cabable of delivering extreme amounts of energy, concentrated on a small amount of space, in a very short period of time." "Most crucibles are kept warm in an oven before and after being used." So it sounds like a normal one will work if you have a way of always keeping it warm and dry! I guess you have to just treat it like its your only child
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
doctor electrons wrote ... "Most crucibles are kept warm in an oven before and after being used." So it sounds like a normal one will work if you have a way of always keeping it warm and dry! I guess you have to just treat it like its your only child
Always be prepared to empty the crucible (pour out all molten metal) while hot.
If you let a substantial amount of metal solidify in the crucible, any attempt to re-melt it will probably crack the crucible as the solid metal expands.
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Just wanted to show my Induction Heater in action
